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Message:
Help: "--" and "="
Posted by YJ on September 10, 2000 at 12:04 PM
I am a beginner in Java and have a question regarding "=" and "++". Listed below are a short program I tried to run and its execution result. Could anyone please be kind enough to let me know why the outputs following "6:" and "14:" are what they are? It seems that "--" doesn't have any effect in those two statements: "n1.i = n2.i --;" and "a = a --;". (Please do not question why I put "++" and "=" in the same statement. I was just curious.) I'll appreciate your answer very much. // Why1.java
class Number { int i; } public class Why1 { public static void main (String[] args) { Number n1 ; Number n2 = new Number(); n1 = n2; n2.i = 40; System.out.println( "4: n1.i=" + n1.i + " n2.i=" + n2.i); n1.i = -- n2.i; System.out.println( "5: n1.i=" + n1.i + " n2.i=" + n2.i); n1.i = n2.i --; System.out.println( "6: n1.i=" + n1.i + " n2.i=" + n2.i); int a ; int b = 10; a = -- b; System.out.println( "11: a=" + a + " b=" + b); a = b --; System.out.println( "12: a=" + a + " b=" + b); a = -- a; System.out.println( "13: a=" + a + " b=" + b); a = a --; System.out.println( "14: a=" + a + " b=" + b); } } // execution result 4: n1.i=40 n2.i=40 5: n1.i=39 n2.i=39 6: n1.i=39 n2.i=39 11: a=9 b=9 12: a=9 b=8 13: a=8 b=8 14: a=8 b=8
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